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Er-Ho-Pr tri-doped lead fluoride mid-infrared laser crystal and preparation method thereof

A hybrid lead fluoride, infrared laser technology, applied in chemical instruments and methods, lasers, crystal growth and other directions, to achieve the effect of reducing life, achieving spectral broadening, and improving energy transfer efficiency

Active Publication Date: 2018-12-18
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Er / Ho / Pr:PbF has not been seen at home and abroad 2 Crystal as a report of mid-infrared laser crystal

Method used

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  • Er-Ho-Pr tri-doped lead fluoride mid-infrared laser crystal and preparation method thereof

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Embodiment 1

[0022] This embodiment discloses a kind of erbium holmium praseodymium (Er 3+ 、Ho 3+ 、Pr 3+ ) triple-doped lead fluoride (PbF 2 ) laser crystal, the chemical formula of the crystal is Er x Ho y PR z :Pb 1-x-y-z f 2 , wherein x=0.1~30mol.%, is the molar percentage of Er ion accounting for Pb ion in the matrix, y=0.1~10mol.%, is the molar percentage of Ho ion accounting for Pb ion in the matrix, z=0.1~5mol.%, is the molar percentage of Pr ions to Pb ions in the matrix.

[0023] Erbium (Er 3+ ) and holmium (Ho 3+ ) at the same time as the active ion, praseodymium (Pr 3+ ) as deactivating ions.

[0024] The laser crystal is used to realize all-solid-state tuned laser output in the 2.5-3.1 micron band.

Embodiment 2

[0026] Er 0.01 Ho 0.01 PR 0.005 Pb 0.975 f 2 Crystal preparation

[0027] The raw materials ErF3, HoF3, PrF3 and PbF2 with a purity greater than 99.999% are uniformly mixed according to the molar ratio of the batching equation in the above-mentioned embodiment 1, and then put into a graphite crucible with a sharp bottom of Φ20×150mm in size, and the crucible is sealed. The crucible is placed in the melting material in the high-temperature zone with a temperature of 1000 ° C in the descending furnace for 8 hours, and then the crucible is lowered at a rate of 1 mm / h. At this time, the temperature gradient within the range of ± 0.5 cm at the crystal solid-liquid interface is 24 ° C / cm, and cooled to room temperature at a rate of 30°C / h after the growth. After the crystal was taken out, it was processed into a sample of 8×8×1mm3 for spectral testing. The fluorescence spectrum was as follows: figure 1 shown.

Embodiment 3

[0029] Er 0.02 Ho 0.02 PR 0.01 Pb 0.95 f 2 Crystal preparation

[0030] The raw materials ErF3, HoF3, PrF3 and PbF2 with a purity greater than 99.999% are uniformly mixed according to the molar ratio of the batching equation in the above-mentioned embodiment 1, and then put into a graphite crucible with a sharp bottom of Φ30×100mm in size, and the crucible is sealed. Put the crucible in a descending furnace in a high temperature zone of 1050°C for 10 hours, and then lower the crucible at a rate of 0.8mm / h. At this time, the temperature gradient within ±0.5cm at the crystal solid-liquid interface is 36°C / cm, and cooled to room temperature at a rate of 40°C / h after the growth.

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Abstract

The invention discloses an Er-Ho-Pr tri-doped lead fluoride mid-infrared laser crystal and a preparation method thereof. According to the invention, in a growing Er-Ho-Pr tri-doped lead fluoride crystal, as Er ions can be excited under 980nm LD, the transition of Er ions from <4>I11 / 2 to <4>I13 / 2 can generate fluorescence near 2.7 micrometers, at the same time a part of energy is transferred fromthe <4>I11 / 2 energy level of Er ions to the <5>I6 energy level of Ho ions, so that transition of Ho ions from <5>I6 to <5>I7 can generate fluorescence near 2.9 micrometers, therefore the full width athalf-maximum of a mid-infrared spectrum can reach 330nm; the incorporation of Pr ions not only enhances the energy transfer efficiency between the <4>I11 / 2 energy level of Er ions and the <5>I6 energy level of Ho ions, but also greatly reduces the <4>I13 / 2 energy level lifetime of Er ions and the <5>I7 energy level lifetime of Ho ions, is conducive to realizing population inversion and laser output, reduces the laser threshold and improves laser efficiency.

Description

technical field [0001] The invention relates to the technical field of laser crystal materials, in particular to an erbium holmium praseodymium (Er 3+ 、Ho 3+ 、Pr 3+ ) triple-doped lead fluoride (PbF 2 ) mid-infrared laser crystal and its preparation method. Background technique [0002] Lasers in the 2.7-3.0 micron band have broad application prospects in bioengineering, medical and health, military and other fields, and are ideal pump sources for obtaining longer wavelength lasers through nonlinear channels. At present, the most concentrated research in the 2.7-3.0 micron band is the use of Er-doped 3+ Laser crystals such as YAG, GGG and LYF, etc., and 2.94 micron doped with Er 3+ The YAG crystal has been industrialized. However, doped Er 3+ Generally, laser materials with a fixed wavelength can only be obtained in a specific matrix, and the erbium ion 4 I 11 / 2 → 4 I 13 / 2 When the transition produces fluorescence, the lifetime of the lower energy level is much hi...

Claims

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Application Information

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IPC IPC(8): C30B29/12C30B11/00H01S3/16
CPCC30B11/00C30B29/12H01S3/1645
Inventor 张沛雄黄杏彬陈振强朱思祁尹浩李真
Owner JINAN UNIVERSITY
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